Upon triggering, one character at random must successfully Save vs. Magic or be turned to glass, along with all their weapons and equipment. They will radiate magic, but will otherwise be as fragile as regular glass. The character will require Dispel Magic, Cure Petrification, or similar spell to be cast at a level of the GM's choosing. Anything that breaks off from the character is gone if/when they return to normal. Dropping the character or knocking them over might well be a death sentence.